Benefits of amplification for speech recognition in background noise.
Benefits of amplification for speech recognition in background noise.
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DOI：
10.1121/1.1506158
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发表时间：
2002-09
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影响因子：
--
通讯作者：
C. Turner;B. Henry
中科院分区：
文献类型：
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作者：
C. Turner;B. Henry
本研究的目的是研究在有背景噪音的情况下，为有感觉神经性听力损失的听众提供可听的演讲的好处。先前的研究表明，当听众在较高的频率上有严重的听力损失时，在这些较高的频率上提供可听的语音（在安静的背景下）通常不会改善语音识别。在本实验中，对不同听力损失程度的听者以多语者牙牙学语为背景进行语音呈现。信号在多个截止频率下进行低通滤波，并通过向听障听众提供额外的高频语音信息来测量语音识别。研究发现，在所有情况下，无论听力损失或频率范围如何，提供可听到的语音都会导致识别分数的增加。随着截止频率的增加，识别的变化，以及每种情况下可听语音信息量（发音指数），被用来计算提供可听语音的“效率”。对于所有程度的听力损失，效率都是积极的。然而，由于噪声背景的影响，识别的增益很小，并且听者获得的最大分数很低。一项对错误模式的分析表明，由于噪音背景下有限的语音可听性，即使是严重受损的听众也会在高频率下使用额外的语音可听性来提高他们对语音“容易”特征（包括发声）的感知。
The purpose of the present study was to examine the benefits of providing audible speech to listeners with sensorineural hearing loss when the speech is presented in a background noise. Previous studies have shown that when listeners have a severe hearing loss in the higher frequencies, providing audible speech (in a quiet background) to these higher frequencies usually results in no improvement in speech recognition. In the present experiments, speech was presented in a background of multitalker babble to listeners with various severities of hearing loss. The signal was low-pass filtered at numerous cutoff frequencies and speech recognition was measured as additional high-frequency speech information was provided to the hearing-impaired listeners. It was found in all cases, regardless of hearing loss or frequency range, that providing audible speech resulted in an increase in recognition score. The change in recognition as the cutoff frequency was increased, along with the amount of audible speech information in each condition (articulation index), was used to calculate the "efficiency" of providing audible speech. Efficiencies were positive for all degrees of hearing loss. However, the gains in recognition were small, and the maximum score obtained by an listener was low, due to the noise background. An analysis of error patterns showed that due to the limited speech audibility in a noise background, even severely impaired listeners used additional speech audibility in the high frequencies to improve their perception of the "easier" features of speech including voicing.